<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<input type="text" id="input">
<input type="button" value="输入" onClick="doSomething();">
<div id="output">welcome</div>
<script>

</script>
</body>
</html>